Wastewater treatment system for PCB

The invention relates to the technical field of printed circuit board wastewater treatment, and particularly relates to a wastewater treatment system for a PCB. Thewastewater treatment system comprises a first reaction tank used for mixing wastewater to obtain a mixed solution, a second reaction tank used for converting part of copper ions in the wastewater into elemental copper, a third reaction tank used for breaking complex of the complex copper and converting the complex copper into copper ions so as to obtain first supernate, a copper deposition tank used for converting the copper ions into elemental copper through a reduction reaction to obtain an elemental copper crude product and second supernate, a coagulating basin used for realizing precipitation of iron ions and ferrous ions, a sintering furnace used for sintering the elemental copper crude product to obtain a sintered block, a smelting furnace used for calcining the sintered block to obtain crude copper, and a refining furnace used for adding a r